HydroBASINS lev08 watershed · #2080452550
Bassin de l'Orne
A watershed (drainage basin) is not a body of water — it is the land area where rainfall converges towards a single river that eventually reaches the sea (or an endorheic basin). Boundaries follow ridgelines.
Crosses 2 administrative regions : Calvados, Orne
Sub-basin area
303,5km²
Upstream area
2 320km²
Discharge
46,22m³/s
Mean elev.
136m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin du Noireau524 km²
- Bassin de l'Orne8 km²
2 dept-equivalent regions (GADM L2)
- 304.4 km²100.0% of basin
- 0.1 km²0.0% of basin
63 communes (GADM L5)Available for FRA, RWA
- Clécy21.42 km²87% commune
- Saint-Martin-de-Sallen18.25 km²100% commune
- Curcy-sur-Orne13.02 km²99% commune
- Croisilles10.29 km²100% commune
- Pierrefitte-en-Cinglais9.75 km²86% commune
- Pont-d'Ouilly9.52 km²48% commune
- Donnay9.37 km²79% commune
- Esson9.03 km²100% commune
- Évrecy8.62 km²100% commune
- Grimbosq8.54 km²100% commune
- La Villette8.14 km²86% commune
- Saint-Omer8.01 km²100% commune
- Trois-Monts7.78 km²100% commune
- Saint-Rémy7.78 km²100% commune
- Culey-le-Patry7.73 km²100% commune
- Sainte-Honorine-du-Fay7.73 km²100% commune
- Saint-Lambert7.52 km²97% commune
- Hamars6.57 km²66% commune
- Mutrécy6.31 km²96% commune
- Les Moutiers-en-Cinglais5.91 km²100% commune
- Avenay5.76 km²100% commune
- Maizet5.70 km²100% commune
- Placy5.44 km²100% commune
- Amayé-sur-Orne5.15 km²100% commune
- Saint-Laurent-de-Condel5.14 km²42% commune
- Espins4.92 km²100% commune
- Cesny-Bois-Halbout4.86 km²77% commune
- Campandré-Valcongrain4.84 km²72% commune
- Cauville4.66 km²79% commune
- Thury-Harcourt4.63 km²100% commune
- Vieux4.53 km²86% commune
- Ouffières4.46 km²100% commune
- Cossesseville4.39 km²100% commune
- Combray4.29 km²100% commune
- Préaux-Bocage4.23 km²100% commune
- Vacognes-Neuilly4.13 km²50% commune
- Le Bô4.08 km²100% commune
- Bonnemaison3.60 km²41% commune
- Le Vey3.45 km²100% commune
- Feuguerolles-Bully3.36 km²40% commune
- Tréprel3.31 km²61% commune
- Esquay-Notre-Dame3.12 km²100% commune
- Clinchamps-sur-Orne2.95 km²49% commune
- La Pommeraye2.62 km²100% commune
- Goupillières1.83 km²100% commune
- La Caine1.66 km²69% commune
- Baron-sur-Odon1.14 km²18% commune
- Caumont-sur-Orne0.96 km²100% commune
- Fresney-le-Vieux0.70 km²26% commune
- Boulon0.70 km²5% commune
- Roucamps0.60 km²10% commune
- Bonnœil0.50 km²7% commune
- Le Détroit0.29 km²5% commune
- Gavrus0.26 km²10% commune
- Bougy0.24 km²8% commune
- Saint-Pierre-la-Vieille0.18 km²1% commune
- Le Plessis-Grimoult0.10 km²1% commune
- Montigny0.09 km²2% commune
- Ménil-Hubert-sur-Orne0.09 km²1% commune
- Fontaine-Étoupefour0.08 km²2% commune
- Maisoncelles-sur-Ajon0.06 km²1% commune
- Acqueville0.04 km²1% commune
- Meslay0.04 km²1% commune
4 intersecting protected areas
Biotope Protection Order
21.07 km² overlap
Vallée de l'Orne et ses affluents
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
5.97 km² overlap
Bassin de la Druance
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.04 km² overlap
Combles de l'église d'Amayé-sur-Orne
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
3 472 distinct species · 47 784 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 33 species (selected proportionally per kingdom among those with at least one documented interaction here) to keep the graph readable. Hover for details, click to explore the full ecosystem of a species.
ℹ️ The territory contains many more species than displayed and all their documented interactions: the graph is intentionally the structural skeleton (top-N species by composite local score, edges filtered by Serrano 2009 disparity filter α=0.2).
Indicateurs du tissu écologique
Tissu écologique de Bassin de l'Orne : 22 espèces reliées par 86 interactions GloBI sur 6 types (connectance 16.3%, filtre Serrano α=0.2). 11 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).
Comparaison sur la connectance du réseau local complet vs distribution nationale (toutes les communes françaises).
Hydroclimate (BasinATLAS lev08)
Mean T°
10,2°C
Annual rain
729mm
Moisture idx (CMI)
-0,03
Runoff
636mm/an
PET
753mm
AET
550mm
Mean slope
4,5°
Water table
247cm
Forest
0%
Crops
48%
Urban
0%
Protected
7%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)